Person: EREN, FATİH
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EREN
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FATİH
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Publication Metadata only Preliminary evidence of an association between the functional c-kit rs6554199 polymorphism and achalasia in a Turkish population(WILEY, 2012) EREN, FATİH; Alahdab, Y. O.; Eren, F.; Giral, A.; Gunduz, F.; Kedrah, A. E.; Atug, O.; Yilmaz, Y.; Kalayci, O.; Kalayci, C.Background C-kit-positive interstitial cells of Cajal (ICC) of the lower esophageal sphincter are reduced in achalasia. Two functional gene polymorphisms (rs2237025 and rs6554199) within the c-kit gene may affect its transcriptional activity. In this pilot study, we hypothesized that these polymorphisms would be associated with achalasia. Methods Genomic DNA was extracted and real-time PCR reactions were used to determine the rs2237025 and rs6554199 c-kit polymorphisms in 88 Turkish patients with achalasia and 101 healthy controls. Key Results The frequency of the T allele of rs6554199 was significantly higher in patients with achalasia [odds ratio (OR): 1.55; 95% confidence interval (CI), 1.03-2.34; P = 0.038] compared with the G allele. Under a dominant model of inheritance, the carriage of at least one T allele was significantly more frequent in patients with achalasia (80.7%) than in controls (65.3%; OR: 2.21; 95% CI, 1.13-4.33; P = 0.022). No association of the c-kit rs2237025 polymorphism with achalasia was detected. Conclusions & Inferences Despite the small sample size and the possibility of a false positive finding, our preliminary data support the hypothesis that the T allele of the c-kit rs6554199 polymorphism may be associated with achalasia in the Turkish population. These findings need to be replicated in other racial-ethnically diverse populations.Publication Metadata only Serum osteopontin levels as a predictor of portal inflammation in patients with nonalcoholic fatty liver disease(ELSEVIER SCIENCE INC, 2013) EREN, FATİH; Yilmaz, Yusuf; Ozturk, Oguzhan; Alandab, Yesim Ozen; Senates, Ebubekir; Colak, Yasar; Doganay, Hamdi Levent; Coskunpinar, Ender; Oltulu, Yasemin Musteri; Eren, Fatih; Atug, Ozlen; Tuncer, Ilyas; Imeryuz, NeseBackground: Osteopontin is a secreted phosphorylated glycoprotein that is expressed by a variety of cell types and that mediates numerous and diverse biological functions. Osteopontin knockout mice are protected from obesity-induced hepatic steatosis. In the present study, we sought to investigate whether serum osteopontin concentrations are associated with liver histology in patients with nonalcoholic fatty liver disease. Methods: Serum levels of osteopontin were measured by enzyme-linked immunosorbent assay in 179 Well-characterized patients with nonalcoholic fatty liver referred for liver histology and 123 control subjects. Results: Serum osteopontin levels were markedly higher in patients with nonalcoholic fatty liver disease than in controls (p < 0.001). Multivariable analysis showed that osteopontin levels were strongly and independently associated with both portal inflammation (beta = 0.294, p < 0.01) and serum aminotransferase levels (aspartate aminotransferase: beta = 0.295, p < 0.01; alanine aminotransferase; beta = 0.285, p < 0.01). Conclusion: In summary, these data demonstrate that serum levels of osteopontin are elevated in nonalcoholic fatty liver disease and are a significant independent predictor of portal inflammation in this clinical entity. (C) 2012 Editrice Gastroenterologica Italiana S.r.l. Published by Elsevier Ltd. All rights reserved.Publication Metadata only Serum levels of omentin, chemerin and adipsin in patients with biopsy-proven nonalcoholic fatty liver disease(TAYLOR & FRANCIS LTD, 2011) EREN, FATİH; Yilmaz, Yusuf; Yonal, Oya; Kurt, Ramazan; Alahdab, Yesim Ozen; Eren, Fatih; Ozdogan, Osman; Celikel, Cigdem Ataizi; Imeryuz, Nese; Kalayci, Cem; Avsar, ErolObjective. The novel adipokines omentin, chemerin, and adipsin are associated with insulin resistance and the components of the metabolic syndrome. We assayed circulating levels of these molecules and examined their association with clinical, biochemical, and histological phenotypes in patients with nonalcoholic fatty liver disease (NAFLD). Material and methods. Serum levels of omentin, chemerin, and adipsin were assayed by enzyme-linked immunosorbent assay in 99 patients with biopsy-proven NAFLD and 75 control subjects. We analyzed associations between adipokines and the characteristics of patients with NAFLD using multivariable linear regression models. Results. Adipsin levels did not differ between patients and controls, whereas both omentin and chemerin levels were significantly higher in patients with biopsy-proven NAFLD than in controls (both p values <0.001). Serum omentin levels were significantly associated with C-reactive protein (r = 0.29, p < 0.01) and the degree of hepatocyte ballooning (r = 0.27, p < 0.01), whereas chemerin showed a modest association with liver fibrosis (r = 0.22, p = 0.04). After stepwise linear regression analysis adjusting for potential confounders, serum omentin levels retained their independent significance as a predictor of hepatocyte ballooning in patients with NAFLD (beta = 1.42; t = 2.79, p < 0.01). Conclusions. Our results suggest that serum omentin levels are raised in patients with NAFLD regardless of potential confounders and represent an independent predictor of hepatocyte ballooning.Publication Metadata only Circulating vaspin levels and epicardial adipose tissue thickness are associated with impaired coronary flow reserve in patients with nonalcoholic fatty liver disease(ELSEVIER IRELAND LTD, 2011) EREN, FATİH; Yilmaz, Yusuf; Kurt, Ramazan; Gurdal, Ahmet; Alahdab, Yesim Ozen; Yonal, Oya; Senates, Ebubekir; Polat, Nihat; Eren, Fatih; Imeryuz, Nese; Oflaz, HuseyinBackground: Patients with nonalcoholic fatty liver disease (NAFLD) have a reduced coronary flow reserve (CFR) and an increased risk of cardiovascular disease. The fat cells that surround coronary arteries may play a central and underrecognized role in development of cardiovascular disease through the systemic secretion of adipokines. We therefore evaluated the relation of epicardial fat thickness, serum levels of epicardial fat-related adipokines (chemerin and vaspin), and CFR in patients with NAFLD. Methods: We investigated 54 patients with biopsy-proven NAFLD and 56 age- and sex-matched controls. CFR and epicardial fat thickness (EFT) were measured by transthoracic echocardiography. Serum levels of chemerin and vaspin were measured by ELISA. Results: EFT was significantly higher (0.64 +/- 0.13 vs. 0.54 +/- 0.10 cm, P < 0.001) and CFR significantly lower (2.11 +/- 0.45 vs. 2.52 +/- 0.62, P < 0.001) in patients with NAFLD than in controls. Serum levels of vaspin and chemerin were both significantly increased in patients with NAFLD compared with controls. Stepwise regression analysis showed that EFT (beta = -0.53, t = -3.7, P < 0.001), serum vaspin levels (beta = -0.30, t = -2.5, P = 0.014), and liver fibrosis (beta = -0.31, t = -2.11, P = 0.041), in the order they entered into the model, were independent predictors of CFR in NAFLD patients. Conclusion: Our data suggest the presence of a complex interplay between EFT, serum vaspin, and liver histology in promoting an impaired hyperemic stimulation of coronary blood flow in patients with NAFLD. (C) 2011 Elsevier Ireland Ltd. All rights reserved.Publication Metadata only Serum levels of vaspin, obestatin, and apelin-36 in patients with nonalcoholic fatty liver disease(W B SAUNDERS CO-ELSEVIER INC, 2011) ÇELİKEL, ÇİĞDEM; Aktas, Bilge; Yilmaz, Yusuf; Eren, Fatih; Yonal, Oya; Kurt, Ramazan; Alandab, Yesim Ozen; Celikel, Cigdem Ataizi; Ozdogan, Osman; Imeryuz, Nese; Kalayci, Cem; Avsar, ErolThe novel adipokines vaspin, obestatin, and apelin-36 are associated with insulin resistance and the components of the metabolic syndrome. We assayed circulating levels of these molecules and examined their association with clinical, biochemical, and histologic phenotypes in patients with nonalcoholic fatty liver disease (NAFLD). Serum levels of vaspin, obestatin, and apelin-36 were assayed by enzyme-linked immunosorbent assay in 91 patients with biopsy-proven NAFLD and 81 controls. We analyzed associations between adipokines and the characteristics of patients with NAFLD using multivariable linear regression models. Univariable analysis showed that concentrations of vaspin and apelin-36 were significantly higher in patients with NAFLD than in controls, whereas no differences in obestatin levels were found. Serum vaspin levels showed a statistically significant association with C-reactive protein (r = 0.378, P < .001) and liver fibrosis scores (r = 0.401, P < .001), whereas apelin-36 levels showed a modest association with homeostasis model assessment of insulin resistance (r = 0.204, P < .01). After stepwise linear regression analysis, serum vaspin levels were the only independent predictor of liver fibrosis scores in patients with NAFLD (beta = 0.37, t = 3.99, P < .01). Serum vaspin levels are raised in patients with NAFLD regardless of potential confounders and represent an independent predictor of liver fibrosis scores. These findings support further investigation of this novel adipokine in metabolic liver diseases. (C) 2011 Elsevier Inc. All rights reserved.